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Unformatted text preview: arise quite naturally in the theory of standing waves, because the normal modes of oscillation of
any uniform continuous system possessing linear equations of motion (e.g., a uniform string, an elastic rod, an
ideal gas) take the form of spatial cosine and sine waves whose wavelengths are rational fractions of one another.
Thus, the instantaneous spatial waveform of such a system can always be represented as a linear superposition of
cosine and sine waves: that is, a Fourier series in space, rather than in time. In fact, the process of determining
the amplitudes and phases of the normal modes of oscillation from the initial conditions is essentially equivalent to
Fourier analyzing the initial conditions in space. (See Sections 5.3 and 6.2.)...
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 Fall '08
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 Waves And Optics

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